In Line Monitoring of VAc-BuA Emulsion Polymerization Reaction in a Continuous Pulsed Sieve Plate Reactor using NIR Spectroscopy |
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Authors: | Dennis Chicoma Verónica Carranza Claudia Sayer Reinaldo Giudici |
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Institution: | 1. Department of Chemical Engng. Escola Politécnica, Universidade de São Paulo, Caixa Postal 61548 – CEP 05424-970 – São Paulo SP – Brasil;2. Department of Chemical and Food Engng. - Universidade Federal de Santa Catarina, Caixa Postal 476 – CEP: 88040-970 – Florianópolis – SC – Brasil |
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Abstract: | Summary: This work deals with the in line and in situ monitoring of the changes in residual monomer concentrations and polymer particle size in the process of emulsion copolymerization of vinyl acetate (VAc) and butyl acrylate (BuA) over the sections of a novel tubular reactor (pulsed sieve plate continuous reactor, PSPC) using NIR spectroscopy. Off-line measurements (gas chromatographic, gravimetric and dynamic light scattering) were used as reference for the development of the multivariate PLS calibration model. All NIR spectra were on-line collected with an IFS 28/N Bruker spectrometer using a probe (transflectance mode) immersed into the reaction medium. The calibration model and validation data were analyzed using the OPUS/QUANT software. The results indicated that there exists a good agreement between values from the NIR calibration models and the off-line reference measured experimental data. Moreover, the on-line NIR can detect efficiently the occurrence of disturbances during the polymerization reaction, a useful tool for the improving the process safety. |
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Keywords: | emulsion polymerization NIR spectroscopy pulsed sieve plate continuous reactor |
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